* [Chyrp](http://chyrp.net/) - An extra-awesome, extra-lightweight blog engine ([Source code](https://github.com/chyrp/chyrp))
* [Dotclear](http://dotclear.org/) - Take control over your blog!
* [Wordpress](https://wordpress.org/) - Create a beautiful website or blog.
* [Blogotext](http://lehollandaisvolant.net/blogotext/en/) - a free blog-engine written in PHP and using SQLite. This offers you both an unmatched simplicity during installation and great performances. ([Source code](https://github.com/timovn/blogotext)
* [Ghost](http://ghost.org/) - Just a blogging platform
* [blosxom](http://blosxom.sourceforge.net/) - a lightweight yet feature-packed weblog application designed from the ground up with simplicity, usability, and interoperability in mind.
* [Anchor CMS](http://anchorcms.com/) - Anchor is a free, lightweight, faster-than-a-bullet, simple blogging system, made for art–directed posts. ([Source code](https://github.com/anchorcms/anchor-cms))
* [Bumpy Booby](http://bumpy-booby.derivoile.fr/) - A simple, responsive and highly customizable PHP bug tracking system. ([Source code](https://github.com/piero-la-lune/Bumpy-Booby))
* [Phproject](http://www.phproject.org/) - A high performance full-featured project management system ([Source code](https://github.com/Alanaktion/phproject), [Demo](http://demo.phproject.org/))
* [Alltube](https://github.com/Rudloff/alltube) - A web interface for [youtube-dl](https://github.com/rg3/youtube-dl), a program to download videos and audio from [more than 100 websites](https://rg3.github.io/youtube-dl/supportedsites.html) ([Demo](http://alltubedownload.net/))
* https://coquelicot.potager.org/ - Coquelicot - Coquelicot is a “one-click” file sharing web application with a focus on protecting users’ privacy. - `GNU-AGPL 3.0`
* https://kolab.org/ - http://git.kolab.org/ - Kolab - Kolab community is a unified communication and collaboration system - Various Free Software / Open Source Software Licenses
* http://www.horde.org/ - Horde - The Horde Project is about creating high quality Open Source applications and libraries, based on PHP and the Horde Framework. - `GPL` + Various Free Software / Open Source Software Licenses
* http://onlyoffice.org/ - Only Office - An office suite that enables you to manage documents, projects, team and customer relations in one place. - GNU - `AGPL 3.0`
* [BuddyPress](http://buddypress.org/about/) - A powerful plugin that takes your WordPress.org powered site beyond the blog with social-network features like user profiles, activity streams, user groups, and more.